How to set up a postgis-adaptered Ruby on Rails app for Heroku deployment? -

i have following:

gems:

gem 'pg', '~> 0.18' gem 'activerecord-postgis-adapter', '4.0.0' gem 'rgeo-geojson' 

initializer: config/initializers/rgeo.rb

require 'rgeo-activerecord'  rgeo::activerecord::spatialfactorystore.instance.tap |config|   # default, use geos implementation spatial columns.   config.default = rgeo::geos.factory_generator    # use geographic implementation point columns.   config.register(rgeo::geographic.spherical_factory(srid: 4326), geo_type: "point") end 

database settings: config/database.yml

default: &default   adapter: postgis   encoding: unicode   username: appname_u   password: password   su_username: appname_su   su_password: pa55w0rd   schema_search_path: "public, postgis"   pool: <%= env.fetch("rails_max_threads") { 5 } %> development:   <<: *default   database: appname_development   script_dir: /usr/local/opt/postgis/share/postgis test:   <<: *default   database: appname_test   script_dir: /usr/local/opt/postgis/share/postgis  production:   <<: *default   database: appname_production   url: <%= env.fetch('database_url', '').sub(/^postgres/, "postgis") %>   username: unfold   password: <%= env['unfold_database_password'] %> 

enable postgis extension of heroku postgresql:

$ heroku pg:psql --app ngrails-unfold > create extension postgis; > select postgis_version();             postgis_version             ---------------------------------------  2.3 use_geos=1 use_proj=1 use_stats=1 (1 row) 

data model migration:

class createlocations < activerecord::migration[5.0]   def change     create_table :locations |t|       t.string :name, null: false       t.st_point :latlon, geographic: true, null: false        t.timestamps     end      add_index :locations, :name   end end 

build packs:

1. possibly frontend app buildpack 2. https://github.com/cyberdelia/heroku-geo-buildpack.git or https://github.com/desaperados/heroku-buildpack-geo.git  3. heroku/ruby 

but still error in production:

nomethoderror (undefined method `property' nil:nilclass) ——— logs ———

heroku[router]: at=info method=post path="/api/locations.json" host=yourappname.herokuapp.com request_id=4053b701-9d3e-479c-8a33-c44e539ccdc8 fwd="45.63.35.55" dyno=web.1 connect=3ms service=28ms status=500 bytes=551  started post "/api/locations.json" 45.63.35.55 @ 2016-11-15 14:36:41 +0000  processing locationscontroller#create json  parameters: {"location"=>{"name"=>"san francisco airport", "latlon"=>"point(-122.381827 37.62161)"}}  begin  location exists (1.7ms)  select  1 one "locations" "locations"."name" = $1 limit $2  [["name", "san francisco airport"], ["limit", 1]] 

——— error logs heroku ———

rollback  completed 500 internal server error in 15ms (activerecord: 6.1ms)  nomethoderror (undefined method `property' nil:nilclass):  app/controllers/locations_controller.rb:20:in `create' 

——— success logs localhost ———-

insert "locations" ("name", "latlon", "created_at", "updated_at") values ($1, $2, $3, $4) returning "id"  [["name", "san francisco airport"], ["latlon", "0020000001000010e6c05e986fda836eb54042cf90ea9e6eeb"], ["created_at", 2016-11-15 14:35:29 utc], ["updated_at", 2016-11-15 14:35:29 utc]]  commit 

so correct steps set postgis-adaptered rails app on heroku?

btw, app runs smoothly on localhost. unable sort out on heroku.

they have explanation on heroku website:

https://devcenter.heroku.com/articles/sqlite3

you should check out , follow step step